free_device rcu callback, scheduled from btrfs_rm_dev_replace_srcdev,
can be processed before btrfs_scratch_superblock is called, which would
result in a use-after-free on btrfs_device contents. Fix this by
zeroing the superblock before the rcu callback is registered.
Cc: Stefan Behrens <sbehr...@giantdisaster.de>
Signed-off-by: Ilya Dryomov <idryo...@gmail.com>
---
fs/btrfs/dev-replace.c | 5 +----
fs/btrfs/volumes.c | 7 ++++++-
2 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index a644353..5aa0718 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -535,10 +535,7 @@ static int btrfs_dev_replace_finishing(struct
btrfs_fs_info *fs_info,
list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
btrfs_rm_dev_replace_srcdev(fs_info, src_device);
- if (src_device->bdev) {
- /* zero out the old super */
- btrfs_scratch_superblock(src_device);
- }
+
/*
* this is again a consistent state where no dev_replace procedure
* is running, the target device is part of the filesystem, the
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 0052ca8..a9ac68a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1715,6 +1715,7 @@ void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info
*fs_info,
struct btrfs_device *srcdev)
{
WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex));
+
list_del_rcu(&srcdev->dev_list);
list_del_rcu(&srcdev->dev_alloc_list);
fs_info->fs_devices->num_devices--;
@@ -1724,9 +1725,13 @@ void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info
*fs_info,
}
if (srcdev->can_discard)
fs_info->fs_devices->num_can_discard--;
- if (srcdev->bdev)
+ if (srcdev->bdev) {
fs_info->fs_devices->open_devices--;
+ /* zero out the old super */
+ btrfs_scratch_superblock(srcdev);
+ }
+
call_rcu(&srcdev->rcu, free_device);
}
--
1.7.10.4
--
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